Writing instrument



FIG. 1 is a rear elevational view showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a perspective view taken from the top and side thereof; and,

FIG. 8 is a perspective view of FIG. 7 in an exploded condition. 

The ornamental design for a “writing instrument,” as shown and described. 